 SCP-466 is an amorphous and animate configuration of four human cardiovascular systems. SCP-466 is considered to be sentient, as it responds to stimuli and pain in appropriate manners. The veins and arteries of SCP-466 are able to move, as their smooth muscle tissue has developed into tissue resembling skeletal muscle. The ends of each appendage is also tipped with a sharp, calcified barb. SCP-466 is observed to be dexterous and extremely mobile, and can even remain on vertical surfaces or ceilings for long periods of time.